Railway truck



P. B. CAMP RAILWAY TRUCK Dec. 27, 1938.

Filed Dec. 5l, 1934 2 Sheets-Sheet 1 mw/ RNA. @mw NN RN/ uw, RN

P. B. CAMP RAILWAY TRUCK Dec. 27, 1938.

Filed Dec. 5l, 1934 2 Sheets-Sheet 2 vnf/f I fl,

Patented Dec. 27, .1938

UNITED STATES RAmwAY TRUCK Percy B. Camp, Maywood, lll., assignor to Cardwell Westinghouse Company, a corporation of Delaware Application December 31, 1934, Serial No. 759,827

12 Claims.

ing drawings, in both of which the downward movement of the bolster is resisted in part by friction between the truck frame columns and spring-advanced shoes carried by the bolster,

such friction being augmented by stationary wedge means for increasing the compression of the shoe springs as the bolster descends.

In the drawings:

Fig. 1 is a detail elevation of a side frame of a railway truck, the bolster and its supports being shown in section;

Fig. 2 is a detail section on the line 2--2 of Fig. 1;

Fig. 3 is a detail section on the line 3-3 of Fig. 1; Y

Fig. 4 is a view similar to Fig. l, showing a modification of the invention; y

Figs. 5 and 6 are detail sectional views on the lines 5-5 and 66, respectively, of Fig. 1.

One of the side frames of a railway truck is shown,` and is provided with the usual top and bottom arch-bar members IIJ, II, and columns I2, I3, connecting these arch-bar members and between which is located the truck bolster I4, comprising top and bottom plates,|5, IS. The bolster is supported on springs I1, shown as of the helical type, which rest upon the lower arch member II. These springs may be of any desired number, four being indicated.

That portion of the bolster I4 which is directly and slidingly engaging the top and bottom memthe columns I2, I3, are a pair of friction plates 28, 29, which preferably rest upon the lower archbar II and are of channel form, their anges embracing the columns, as most plainly shown in Fig. 3.

The downward movement of the bolster is at all times resisted by the springs I1, and by the 5 friction developed by the shoes I8, I9, and the plates 28, 29. The frictional resistance isl augmented as the bolster moves downwardly bythe action of the wedge element 26 in forcing apart thc spring seats .24, 25, thus compressing the 10 springs 22, 23,.. and gradually augmenting the pressure of the friction shoes upon the plates 28, 29. The friction is. of course, gradually dimin- .ished upon recoil.

In the construction shown in Figs. 4, 5 and 6, the side frame of the `truck and the bolster I4 may be of the same form as in the construction just described. Springs 30, 3l, housed within the chamber of the bolster bear outwardly against friction shoes 32', 33, corresponding in form and function with the shoes I8, I9. The springs 38, 3| react a/gainst inner spring seats 34, 35, which, when adjusted to service position, are stationary, except as hereinafter pointed out. The inner faces of the columns, as I3, are engaged by the friction shoes and are inclined inwardly and downwardly, to cause a wedging action for increasing the spring pressure on the shoes as the bolster descends. Preferably the columns are faced with upwardly tapering plates 36, 31, of suitable friction-resisting metal (the inner faces of the columns being upright) which overlap their margins, and rest upon the lower arch II.

A tapering or wedge-shaped adjusting bar 38 is pivoted adjacent the end of the bolster I4, as shown at 39, and projects into the chamber within which the springs 30, 3I, are housed, engaging correspondingly inclined surfaces on the rear faces of the spring seats 34, 35. To provide for the adjustment of the spring tension the bar 38 is adapted to be shifted longitudinally by any suitable means. As shown, it is provided with a plurality of longitudinal apertures for receiving the pivot pin 39.

Each of the seats 34, 35, reacts upon the other through the bar 38 without putting the latter under lateral strain, should the pressure for any reason be unequal through the two springs because of the pivotal mounting of the bar. Longitudnal. shifting of the bar 38 is provided for to make readjustment possible, as the springs 30, 3|, become permanently shortened in service. To this end the bar is provided with an additional pivot hole 4 ing therefrom, a hollow bolster,located-between.

the seats.

In assembling the parts in this construction the` bolster is thrust into the lower part of the space between the columns, the springs 30 and 3l, inner spring seats and friction shoes being rst applied to it, and the plates 3B, 31, are now inserted laterally upward and fitted against the columns, the relatively wide spacing of the lower portions of the columns, as shown in Fig. 4, facilitating this operation. The adjusting element 38 is now entered. This adjusting element places the springs 3|), 3|, under initial but slight compression, and resists inward movement of the spring seats 34, 35, as the friction shoes 32," 33, y

side walls of the bolster, a pair of springs urging the-shoes against the liners, spring -seats for the vinner -ends' of the last-named springs, and a A spreading element interposed between the seats.

are forced backwardly by the wedging action of, the tapering plates 36, 31, as the bolster descends, In action the resistance to downward movement of the bolster is gradually augmented by reason of the tapering form of the plates 36, 31, and is gradually diminished on recoil.

In both forms of construction the load is normally supported by the springs I1., Vertical movement of the bolster is steadied by the friction action, the resistance being gradually augmented and diminished, and the objectionable rythmic movement frequently 'developed being prevented.

The invention may be differently-'embodied within the scope Aof the appended I claim as my -invention .-A

claims.

1. In a railway truck, in combination, as'ide frame having a lower arch-bar-.and columns ris' ing therefrom, a hollow bolsterlhaving openings in its side walls, supporting springsl for the bol` ster, friction shoes crossing the'op'enings'in the bolster walls, springs urging the shoes against the columns, a pair of spring-seats interposed between the last-named springs, and a stationarywedge interposed'between upstanding spreading 2. In a railway trucnm combination, fa, side frame having a lower arch-bar, and columns rising therefrom, a hollow bolster located .between the columns and having openings in-itsside walls,

a pair of friction shoes'carried by thebolster and crossing its side openings-a pair of spring seats mounted within the bolsterl their adjacent faces flaring downwardly, a spreading wedge projecting upwardlyfrom the lower arch bar and engaging the wedge faces of the seats, springs interposed between the seats and the shoes 'for` urging the latter against the columns, -and springs rising from the lower arch-bar and sup.- porting the bolster. Y

3. In a railway-truck, in combination, a side frame having a lower arch-bar, and columns risfaces flaring-downwardly, a spreadingwedge projecting upwardly fromthe lower arch-bar'and engagingthewedge faces ofthe seats, springsA interposed between 'the seats' and the shoes for urging the latter -againstthecolumns, friction plates lining the inner faces of the'columns, and 1 springs rising from the lower arch-bar-and supporting the bolsten f 4. In a railway truck,.- in; combination,- a side frame having .a lower archbar' andcolumns rising therefrom, a hollowbolstervertically -movablebetween the columns and having open sides, springs supporting the-bolsterfrom, the lower arch bar,`upwa'rdly taperingv friction'- liners for the inner faces of the columns,friction shoes carl--l 5.In a railway truck,` in combination, a side frame having alower arch bar and columns rising therefrom, a hollow bolster vertically movable between the columns and having open sides, springsY supporting the bolster from the lower arch-bar, upwardly tapering friction liners for the vinner Vfaces ofthe columns, friction shoes carried bythe bolster and'crossing the openings vin the 6.-'In.a vrailway truck, in combination, a side frame having a lower arch-bar and columns risarch-bar, `upwardly tapering friction liners for the' -inner faceslofz the columns, friction shoes m'cvablewith the bolster and crossing the openings in the side walls of the bolster, a pair of springs urging the shoes against the liners, spring seats for the inner ends of the last-named springs, and -an oscillatable fspreading `element inter-A posed between the seats.

'7.. In arailway truck, in combination, a side frame havinga lower 'arch bar and columns rising therefrom, a.- hollow bolster vertically movable between' thev4 columns. and having open sides,

springs vsupporting the bolster from 'the lower archV bar, upwardly taperingfriction liners vfor the inner faces of the columns, friction shoes carried by the rbolsterand crossing the openings in the sidewalls of the bolster, a pair of springs urging'the shoes against theliners, spring seats for `theinn'er ends of the last-named springs, and a wedgeshaped and longitudinally adjust- 'able spreading element interposed between the seats. v 8. Ina ,railway truck, in combination, a. side Vframe having top and bottom bars and a pair of relatively spaced vertical -columns connecting the bars, the upper portions of opposing faces of the columns being offset toward each other, a. bolster located between the columns and being laterally open and vertically channeled to receive the off- Vset portions thereof, upwardlytapering wear plates seated, against such offset portions, wear plates carried' by the bolster and crossing the lateralopeningsand engaging the tapered plates,

springs 'housed within the'bolster and urging the last defined wear plates outward, and supporting springs for' the bolster carried by the bottom shoes:carried. by the bolster,` spring means for' advancing said shoes for exerting lateral pressure onathe columns' for frictionally resisting the vertical movement of the bolster, and means including atfleast one stationaryV wedge member associated. with said frame for augmenting such-pressure by oompre'ssingsaid spring means as the.

bolster descends.

10. In a railway truck, in combination, aside framev comprisinga tension member, a compres- `sion-. member,. and spacedvertical columns con- Anec't'ing saidmembers, atruck bolster having an end located between said columns, springs supporting said bolster from said side frame, friction plates mounted on, opposing faces of said columns and presenting, opposed downwardly converging surfaces, friction shoes associated with said bolster end and slidably supported thereby for reciprocable motion laterally of said bolster, surfaces on said shoes adapted to engage said downwardly converging surfaces, andv springs chambered within said bolster end for urging said shoes into continuous frictional engagement with said downwardly converging surfaces.

11. In a railway truck, C, side frame member, a bolster member, bolster member supporting springs beneath said bolster member for supporting the latter from said side frame member, a friction element movable with said side frame member and having a vertical friction surface, a wedge element, and means having wedging and friction surfaces engaging said friction element and wedge element for frictionally dampening the vertical vibrations of said springs, said means 4including a spring in addition to said bolster in frictional contact, said means having at least a portion thereof movable with one of said members and said wedge element being movable with the other of said members.

l2. In a railway truck, a side frame member, a bolster member having a, portion rectangular in crosssection, bolster member supporting springs beneath said portion of the bolster member for supporting the bolster member from said side frame member, a friction element movable with said side frame member and having a vertical vfrctional surface, a wedge element separate from the bolster, and means having wedging and friction surfaces engaging said friction element and wedge element :for frictionally dampening the vertical vibrations of said springs, said means including a spring in addition tov said bolster member supporting springs for holding the parts in frictional contact, said means having at least a portion thereof movable with vone of said members and said wedge element being movable with the other of said members.

PERCY B. CAMP'. 

